import Vue from 'vue'
// 导入 Router 构造函数
import Router from 'vue-router'

Vue.use(Router)

/* Layout */
// 导入 Layout 实例
import Layout from '@/layout'

// 导入八个动态路由规则对象
import approvalsRoutes from './modules/approvals'
import attendancesRoutes from './modules/attendances'
import employeesRoutes from './modules/employees'
import departmentsRoutes from './modules/departments'
import salarysRoutes from './modules/salarys'
import permissionRoutes from './modules/permissions'
import settingsRoutes from './modules/settings'
import socialRoutes from './modules/social'

// 定义动态路由表数组
export const asyncRoutes = [
  employeesRoutes,
  settingsRoutes,
  approvalsRoutes,
  attendancesRoutes,
  salarysRoutes,
  permissionRoutes,
  socialRoutes,
  departmentsRoutes
]

/**
 * Note: sub-menu only appear when route children.length >= 1
 * Detail see: https://panjiachen.github.io/vue-element-admin-site/guide/essentials/router-and-nav.html
 *
 * hidden: true                   if set true, item will not show in the sidebar(default is false)
 * alwaysShow: true               if set true, will always show the root menu
 *                                if not set alwaysShow, when item has more than one children route,
 *                                it will becomes nested mode, otherwise not show the root menu
 * redirect: noRedirect           if set noRedirect will no redirect in the breadcrumb
 * name:'router-name'             the name is used by <keep-alive> (must set!!!)
 * meta : {
    roles: ['admin','editor']    control the page roles (you can set multiple roles)
    title: 'title'               the name show in sidebar and breadcrumb (recommend set)
    icon: 'svg-name'/'el-icon-x' the icon show in the sidebar
    breadcrumb: false            if set false, the item will hidden in breadcrumb(default is true)
    activeMenu: '/example/list'  if set path, the sidebar will highlight the path you set
  }
 */

/**
 * constantRoutes
 * a base page that does not have permission requirements
 * all roles can be accessed
 */

// constantRoutes：静态路由表(所有人都可以访问的路由)
export const constantRoutes = [
  {
    // 登录
    path: '/login',
    component: () => import('@/views/login/index'), // 懒加载，提高首屏加载速度
    //  hidden：true表示当前路由不会出现在主页的左侧菜单
    hidden: true
  },
  {
    // 404
    path: '/404',
    component: () => import('@/views/404'),
    hidden: true
  },
  {
    // Layout
    path: '/',
    component: Layout,
    redirect: '/dashboard',
    children: [
      {
        // 首页
        path: 'dashboard',
        name: 'dashboard',
        component: () => import('@/views/dashboard/index'),
        // title：菜单名字
        // icon：侧边栏小图标
        meta: { title: '首页', icon: 'dashboard' }
      }
    ]
  }

  // 404 page must be placed at the end !!!
  // { path: '*', redirect: '/404', hidden: true }
]

// todo：动态路由表(需要通过权限控制的路由)

// 创建路由实例，把new VueRouter()写在了函数中
const createRouter = () =>
  new Router({
    // 路由模式：默认是hash模式，可选值还有history模式
    // mode: 'history', // require service support
    // 当路由切换的时候，让页面滚动到最顶部
    scrollBehavior: () => ({ y: 0 }),
    // 临时让静态路由表和动态路由表合并(当下用户可以看到所有菜单)
    // routes: [...constantRoutes, ...asyncRoutes]
    routes: constantRoutes
  })

// 调用创建路由实例函数，接收路由实例
const router = createRouter()

// Detail see: https://github.com/vuejs/vue-router/issues/1234#issuecomment-357941465
// 重置路由的方法
export function resetRouter() {
  const newRouter = createRouter()
  router.matcher = newRouter.matcher // reset router
}

// 导出router实例，提供给其他js模块使用
export default router
